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Mark A. Riddle

Johns Hopkins University

ORCID: 0000-0001-8764-2134

Publishes on Obsessive-Compulsive Spectrum Disorders, Attention Deficit Hyperactivity Disorder, Autism Spectrum Disorder Research. 282 papers and 25.6k citations.

282Publications
25.6kTotal Citations

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Top publicationsby citations

Fluvoxamine for the Treatment of Anxiety Disorders in Children and Adolescents
John T. Walkup, Michael J. Labellarte, Mark A. Riddle et al.|New England Journal of Medicine|2001
Cited by 597Open Access

BACKGROUND: Drugs that selectively inhibit serotonin reuptake are effective treatments for adults with mood and anxiety disorders, but limited data are available on the safety and efficacy of serotonin-reuptake inhibitors in children with anxiety disorders. METHODS: We studied 128 children who were 6 to 17 years of age; who met the criteria for social phobia, separation anxiety disorder, or generalized anxiety disorder; and who had received psychological treatment for three weeks without improvement. The children were randomly assigned to receive fluvoxamine (at a maximum of 300 mg per day) or placebo for eight weeks and were evaluated with rating scales designed to assess the degree of anxiety and impairment. RESULTS: Children in the fluvoxamine group had a mean (+/-SD) decrease of 9.7+/-6.9 points in symptoms of anxiety on the Pediatric Anxiety Rating Scale (range of possible scores, 0 to 25, with higher scores indicating greater anxiety), as compared with a decrease of 3.1+/-4.8 points among children in the placebo group (P<0.001). On the Clinical Global Impressions-Improvement scale, 48 of 63 children in the fluvoxamine group (76 percent) responded to the treatment, as indicated by a score of less than 4, as compared with 19 of 65 children in the placebo group (29 percent, P<0.001). Five children in the fluvoxamine group (8 percent) discontinued treatment because of adverse events, as compared with one child in the placebo group (2 percent). CONCLUSIONS: Fluvoxamine is an effective treatment for children and adolescents with social phobia, separation anxiety disorder, or generalized anxiety disorder.

Psychotropic Practice Patterns for Youth
Julie M. Zito, Daniel J. Safer, Susan dosReis et al.|Archives of Pediatrics and Adolescent Medicine|2003
Cited by 526

OBJECTIVE: To examine changes in the full spectrum of psychotropic medication treatment for youths from 1987 to 1996. METHODS: A population-based analysis of community treatment data on nearly 900,000 youths enrolled in 2 US health care systems included (1) computerized Medicaid data from 2 states (a midwestern state and a mid-Atlantic state) composed of outpatient prescription claims and enrollment records and (2) computerized prescription dispensing records from a group-model health maintenance organization. Ten 1-year cross-sectional data sets from 1987 through 1996 were analyzed. RESULTS: Total psychotropic medication prevalence for youths increased 2- to 3-fold and included most classes of medication. The rapid growth since 1991 of alpha-agonists, neuroleptics, and "mood stabilizer" anticonvulsants was particularly notable. The 1996 prevalence of any psychotropic medication among youths younger than 20 years was remarkably similar (5.9%-6.3%) across all 3 sites, with stimulants and antidepressants consistently ranked first and second. Medicaid rates almost always exceeded health maintenance organization rates by large margins, particularly for alpha-agonists, neuroleptics, "mood stabilizer" anticonvulsants, and lithium. Youths in health maintenance organizations had rates similar to Medicaid-insured youths for antidepressants and hypnotics. Over the decade, there was a proportional increase in females receiving stimulants and in males receiving antidepressants, particularly for the 10- to 14-year-old group. The prevalence ratios of whites to African Americans narrowed substantially in 1 Medicaid site. CONCLUSIONS: Youth psychotropic treatment utilization during the 1990s nearly reached adult utilization rates. Youth findings can be used to accurately assess the duration of treatment and unforeseen practice pattern changes, and to identify safety concerns.